{
  "name": "California Oil & Gas Formations and Plays, Ranked by Well Count",
  "publisher": "Buckhead Energy",
  "url": "https://www.buckheadenergy.com/formations-california",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "doi": "https://doi.org/10.5281/zenodo.21442884",
  "dataAsOf": "2026-08-16",
  "count": 16,
  "formations": [
    {
      "state": "CA",
      "formationSlug": "monterey-temblor",
      "formationName": "Monterey-Temblor",
      "wellCount": 96601,
      "activeOperators": 946,
      "totalLateralFt": "3558284",
      "recentPermits24Mo": 4611,
      "primaryCounties": "KERN, KINGS, FRESNO, TULARE",
      "topOperators": [
        {
          "name": "AERA ENERGY",
          "slug": "aera-energy",
          "wells": 44660
        },
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 16193
        },
        {
          "name": "CALIFORNIA RESOURCES ELK HILLS LLC",
          "slug": "california-resources-elk-hills-llc",
          "wells": 7377
        },
        {
          "name": "BERRY PETROLEUM COMPANY",
          "slug": "berry-petroleum-company",
          "wells": 7207
        },
        {
          "name": "SENTINEL PEAK RESOURCES CA",
          "slug": "sentinel-peak-resources-ca",
          "wells": 5640
        },
        {
          "name": "CALIFORNIA RESOURCES PRODUCTION",
          "slug": "california-resources-production",
          "wells": 5275
        },
        {
          "name": "CRIMSON RESOURCE MANAGEMENT",
          "slug": "crimson-resource-management",
          "wells": 1760
        },
        {
          "name": "HOLMES WESTERN OIL",
          "slug": "holmes-western-oil",
          "wells": 1012
        },
        {
          "name": "SHELL OIL COMPANY",
          "slug": "shell-oil-company",
          "wells": 604
        },
        {
          "name": "MOBIL OIL",
          "slug": "mobil-oil",
          "wells": 420
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "san-joaquin-basin",
      "formationName": "San Joaquin Basin",
      "wellCount": 75960,
      "activeOperators": 2643,
      "totalLateralFt": "3940071",
      "recentPermits24Mo": 3627,
      "primaryCounties": "KERN, FRESNO, TULARE, SAN BENITO, MADERA",
      "topOperators": [
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 34514
        },
        {
          "name": "AERA ENERGY",
          "slug": "aera-energy",
          "wells": 8885
        },
        {
          "name": "CALIFORNIA RESOURCES PRODUCTION",
          "slug": "california-resources-production",
          "wells": 5598
        },
        {
          "name": "E & B NATURAL RESOURCES MANAGEMENT",
          "slug": "e-b-natural-resources-management",
          "wells": 3032
        },
        {
          "name": "SENTINEL PEAK RESOURCES CA",
          "slug": "sentinel-peak-resources-ca",
          "wells": 2823
        },
        {
          "name": "MACPHERSON OIL COMPANY",
          "slug": "macpherson-oil-company",
          "wells": 1236
        },
        {
          "name": "BERRY PETROLEUM COMPANY",
          "slug": "berry-petroleum-company",
          "wells": 1175
        },
        {
          "name": "SHELL OIL COMPANY",
          "slug": "shell-oil-company",
          "wells": 537
        },
        {
          "name": "BELLAIRE OIL COMPANY",
          "slug": "bellaire-oil-company",
          "wells": 535
        },
        {
          "name": "HUNTER EDISON OIL DEVELOPMENT LTD",
          "slug": "hunter-edison-oil-development-ltd",
          "wells": 525
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "monterey",
      "formationName": "Monterey",
      "wellCount": 46412,
      "activeOperators": 3224,
      "totalLateralFt": "3823663",
      "recentPermits24Mo": 812,
      "primaryCounties": "LOS ANGELES, ORANGE, VENTURA, SANTA BARBARA, LOS ANGELES OFFSHORE",
      "topOperators": [
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 4975
        },
        {
          "name": "TIDELANDS OIL PRODUCTION COMPANY",
          "slug": "tidelands-oil-production-company",
          "wells": 3825
        },
        {
          "name": "AERA ENERGY",
          "slug": "aera-energy",
          "wells": 2634
        },
        {
          "name": "CALIFORNIA RESOURCES PRODUCTION",
          "slug": "california-resources-production",
          "wells": 2209
        },
        {
          "name": "UNION OIL COMPANY OF CALIFORNIA",
          "slug": "union-oil-company-of-california",
          "wells": 1931
        },
        {
          "name": "CALNRG OPERATING LLC",
          "slug": "calnrg-operating-llc",
          "wells": 1919
        },
        {
          "name": "THUMS LONG BEACH COMPANY",
          "slug": "thums-long-beach-company",
          "wells": 1893
        },
        {
          "name": "SENTINEL PEAK RESOURCES CA",
          "slug": "sentinel-peak-resources-ca",
          "wells": 1657
        },
        {
          "name": "EXXON MOBIL",
          "slug": "exxon-mobil-corporation",
          "wells": 1210
        },
        {
          "name": "UNION PACIFIC RESOURCES COMPANY",
          "slug": "union-pacific-resources-company",
          "wells": 898
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "sacramento-basin",
      "formationName": "Sacramento Basin",
      "wellCount": 10679,
      "activeOperators": 815,
      "totalLateralFt": "458128",
      "recentPermits24Mo": 276,
      "primaryCounties": "SOLANO, YOLO, COLUSA, GLENN, SAN JOAQUIN",
      "topOperators": [
        {
          "name": "CALIFORNIA RESOURCES PRODUCTION",
          "slug": "california-resources-production",
          "wells": 1861
        },
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 755
        },
        {
          "name": "ATLANTIC OIL COMPANY",
          "slug": "atlantic-oil-company",
          "wells": 316
        },
        {
          "name": "AMERADA HESS",
          "slug": "amerada-hess",
          "wells": 260
        },
        {
          "name": "CAPITOL OIL",
          "slug": "capitol-oil",
          "wells": 217
        },
        {
          "name": "SHELL OIL COMPANY",
          "slug": "shell-oil-company",
          "wells": 174
        },
        {
          "name": "PHILLIPS PETROLEUM COMPANY",
          "slug": "phillips-petroleum-company",
          "wells": 166
        },
        {
          "name": "EXXON MOBIL",
          "slug": "exxon-mobil-corporation",
          "wells": 164
        },
        {
          "name": "PACIFIC GAS & ELECTRIC COMPANY",
          "slug": "pacific-gas-electric-company",
          "wells": 162
        },
        {
          "name": "ROSETTA RESOURCES OPERATING",
          "slug": "rosetta-resources-operating-lp",
          "wells": 157
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "coastal-basins",
      "formationName": "Coastal Basins",
      "wellCount": 5514,
      "activeOperators": 472,
      "totalLateralFt": "329699",
      "recentPermits24Mo": 340,
      "primaryCounties": "MONTEREY, SAN LUIS OBISPO, KERN, SAN BENITO, SANTA BARBARA",
      "topOperators": [
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 1810
        },
        {
          "name": "AERA ENERGY",
          "slug": "aera-energy",
          "wells": 1532
        },
        {
          "name": "SENTINEL PEAK RESOURCES CA",
          "slug": "sentinel-peak-resources-ca",
          "wells": 526
        },
        {
          "name": "SHELL OIL COMPANY",
          "slug": "shell-oil-company",
          "wells": 193
        },
        {
          "name": "PHILLIPS PETROLEUM COMPANY",
          "slug": "phillips-petroleum-company",
          "wells": 70
        },
        {
          "name": "E & B NATURAL RESOURCES MANAGEMENT",
          "slug": "e-b-natural-resources-management",
          "wells": 65
        },
        {
          "name": "CALNRG OPERATING LLC",
          "slug": "calnrg-operating-llc",
          "wells": 59
        },
        {
          "name": "EXXON MOBIL",
          "slug": "exxon-mobil-corporation",
          "wells": 57
        },
        {
          "name": "GRACE PETROLEUM",
          "slug": "grace-petroleum",
          "wells": 53
        },
        {
          "name": "ARCO OIL & GAS COMPANY",
          "slug": "arco-oil-gas-company",
          "wells": 51
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "los-angeles-basin",
      "formationName": "Los Angeles Basin",
      "wellCount": 3859,
      "activeOperators": 773,
      "totalLateralFt": "241944",
      "recentPermits24Mo": 148,
      "primaryCounties": "LOS ANGELES, ORANGE, LOS ANGELES OFFSHORE, SAN BERNARDINO, VENTURA",
      "topOperators": [
        {
          "name": "SHADOW WOLF ENERGY LLC",
          "slug": "shadow-wolf-energy-llc",
          "wells": 535
        },
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 356
        },
        {
          "name": "SENTINEL PEAK RESOURCES CA",
          "slug": "sentinel-peak-resources-ca",
          "wells": 283
        },
        {
          "name": "Southern Community",
          "slug": "southern-community",
          "wells": 257
        },
        {
          "name": "WEST ENERGY OPERATING LLC",
          "slug": "west-energy-operating-llc",
          "wells": 119
        },
        {
          "name": "WARREN E & P",
          "slug": "warren-e-p",
          "wells": 116
        },
        {
          "name": "CALTICO OIL",
          "slug": "caltico-oil",
          "wells": 94
        },
        {
          "name": "THUMS LONG BEACH COMPANY",
          "slug": "thums-long-beach-company",
          "wells": 88
        },
        {
          "name": "THE TERMO COMPANY",
          "slug": "the-termo-company",
          "wells": 67
        },
        {
          "name": "CRIMSON RESOURCE MANAGEMENT",
          "slug": "crimson-resource-management",
          "wells": 63
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "ventura-basin",
      "formationName": "Ventura Basin",
      "wellCount": 3052,
      "activeOperators": 526,
      "totalLateralFt": "161171",
      "recentPermits24Mo": 64,
      "primaryCounties": "VENTURA, LOS ANGELES, VENTURA OFFSHORE, SANTA BARBARA",
      "topOperators": [
        {
          "name": "CARBON CALIFORNIA OPERATING COMPANY LLC",
          "slug": "carbon-california-operating-company-llc",
          "wells": 606
        },
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 245
        },
        {
          "name": "CALNRG OPERATING LLC",
          "slug": "calnrg-operating-llc",
          "wells": 229
        },
        {
          "name": "SHELL OIL COMPANY",
          "slug": "shell-oil-company",
          "wells": 102
        },
        {
          "name": "UNION OIL COMPANY OF CALIFORNIA",
          "slug": "union-oil-company-of-california",
          "wells": 74
        },
        {
          "name": "THE TERMO COMPANY",
          "slug": "the-termo-company",
          "wells": 53
        },
        {
          "name": "ARGO PETROLEUM",
          "slug": "argo-petroleum",
          "wells": 49
        },
        {
          "name": "ARCO OIL & GAS COMPANY",
          "slug": "arco-oil-gas-company",
          "wells": 48
        },
        {
          "name": "AMERICAN OIL",
          "slug": "american-resources-inc",
          "wells": 46
        },
        {
          "name": "ADOLFO CAMARILLO",
          "slug": null,
          "wells": 46
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "santa-maria-basin",
      "formationName": "Santa Maria Basin",
      "wellCount": 1767,
      "activeOperators": 289,
      "totalLateralFt": "31721",
      "recentPermits24Mo": 18,
      "primaryCounties": "SANTA BARBARA, SANTA BARBARA OFFSHORE, SAN LUIS OBISPO, SANTA ROSA ISLAND, SANTA CRUZ AREA",
      "topOperators": [
        {
          "name": "E & B NATURAL RESOURCES MANAGEMENT",
          "slug": "e-b-natural-resources-management",
          "wells": 376
        },
        {
          "name": "SUNSET OIL COMPANY",
          "slug": "sunset-exploration",
          "wells": 187
        },
        {
          "name": "ARCO OIL & GAS COMPANY",
          "slug": "arco-oil-gas-company",
          "wells": 108
        },
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 102
        },
        {
          "name": "SEASIDE OIL COMPANY",
          "slug": null,
          "wells": 86
        },
        {
          "name": "SABA PETROLEUM",
          "slug": "saba-petroleum",
          "wells": 69
        },
        {
          "name": "ORYX ENERGY COMPANY",
          "slug": "oryx-energy-company",
          "wells": 55
        },
        {
          "name": "Southern Community",
          "slug": "southern-community",
          "wells": 34
        },
        {
          "name": "ATLANTIC RICHFIELD COMPANY",
          "slug": "atlantic-richfield-company",
          "wells": 34
        },
        {
          "name": "PHILLIPS PETROLEUM COMPANY",
          "slug": "phillips-petroleum-company",
          "wells": 31
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "southern-california-borderlands-province",
      "formationName": "Southern California Borderlands Province",
      "wellCount": 931,
      "activeOperators": 35,
      "totalLateralFt": "399915",
      "recentPermits24Mo": 54,
      "primaryCounties": "LOS ANGELES, ORANGE, SANTA CATALINA AREA, LOS ANGELES OFFSHORE, ORANGE OFFSHORE",
      "topOperators": [
        {
          "name": "TIDELANDS OIL PRODUCTION COMPANY",
          "slug": "tidelands-oil-production-company",
          "wells": 285
        },
        {
          "name": "CALIFORNIA RESOURCES PRODUCTION",
          "slug": "california-resources-production",
          "wells": 230
        },
        {
          "name": "BETA OPERATING COMPANY",
          "slug": "beta-operating-company",
          "wells": 138
        },
        {
          "name": "THUMS LONG BEACH COMPANY",
          "slug": "thums-long-beach-company",
          "wells": 133
        },
        {
          "name": "DCOR",
          "slug": "dcor",
          "wells": 37
        },
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 16
        },
        {
          "name": "CITY OF NEWPORT BEACH",
          "slug": "city-of-newport-beach",
          "wells": 16
        },
        {
          "name": "UNION PACIFIC RESOURCES COMPANY",
          "slug": "union-pacific-resources-company",
          "wells": 10
        },
        {
          "name": "EXXON MOBIL",
          "slug": "exxon-mobil-corporation",
          "wells": 9
        },
        {
          "name": "ARMSTRONG PETROLEUM",
          "slug": "armstrong-petroleum",
          "wells": 7
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "salton-basin",
      "formationName": "Salton Basin",
      "wellCount": 332,
      "activeOperators": 145,
      "totalLateralFt": "0",
      "recentPermits24Mo": 3,
      "primaryCounties": "IMPERIAL, RIVERSIDE, SAN BERNARDINO",
      "topOperators": [
        {
          "name": "CARDOX CORP",
          "slug": null,
          "wells": 125
        },
        {
          "name": "PRADO PETROLEUM",
          "slug": "prado-petroleum",
          "wells": 14
        },
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 8
        },
        {
          "name": "THE HAMPTON OIL",
          "slug": "the-hampton-oil",
          "wells": 6
        },
        {
          "name": "CALIFORNIA TIME PETROLEUM",
          "slug": null,
          "wells": 5
        },
        {
          "name": "LYNNHART COMPANY INC",
          "slug": "lynnhart-company-inc",
          "wells": 4
        },
        {
          "name": "J B NELSON",
          "slug": null,
          "wells": 4
        },
        {
          "name": "PACIFIC-IMPERIAL DRI-ICE INC",
          "slug": null,
          "wells": 4
        },
        {
          "name": "A L HUNTER OPER",
          "slug": null,
          "wells": 3
        },
        {
          "name": "104 OIL & DRILLING COMPANY",
          "slug": null,
          "wells": 3
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "northern-coast-range-prov",
      "formationName": "Northern Coast Range Prov",
      "wellCount": 328,
      "activeOperators": 136,
      "totalLateralFt": "1588",
      "recentPermits24Mo": 16,
      "primaryCounties": "SANTA CLARA, ALAMEDA, SONOMA, NAPA, MENDOCINO",
      "topOperators": [
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 35
        },
        {
          "name": "PATRIOT RESOURCES",
          "slug": "patriot-resources",
          "wells": 21
        },
        {
          "name": "SARGENT OIL COMPANY",
          "slug": null,
          "wells": 20
        },
        {
          "name": "H W COVERT",
          "slug": null,
          "wells": 14
        },
        {
          "name": "E & B NATURAL RESOURCES MANAGEMENT",
          "slug": "e-b-natural-resources-management",
          "wells": 12
        },
        {
          "name": "PETALUMA OIL & GAS DEVELOPMENT COMPANY",
          "slug": "petaluma-oil-gas-development-company",
          "wells": 11
        },
        {
          "name": "HERSHEY OIL",
          "slug": null,
          "wells": 9
        },
        {
          "name": "MOBIL OIL",
          "slug": "mobil-oil",
          "wells": 8
        },
        {
          "name": "E C BROWN OPERATOR",
          "slug": null,
          "wells": 7
        },
        {
          "name": "SHELL OIL COMPANY",
          "slug": "shell-oil-company",
          "wells": 7
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "santa-cruz-basin",
      "formationName": "Santa Cruz Basin",
      "wellCount": 290,
      "activeOperators": 108,
      "totalLateralFt": "0",
      "recentPermits24Mo": 13,
      "primaryCounties": "SAN MATEO, SANTA CRUZ, MARIN, MONTEREY",
      "topOperators": [
        {
          "name": "NEAVES PETRO DEVELOPMENTS",
          "slug": null,
          "wells": 40
        },
        {
          "name": "CHEVRON",
          "slug": "chevron",
          "wells": 26
        },
        {
          "name": "UNION OIL COMPANY OF CALIFORNIA",
          "slug": "union-oil-company-of-california",
          "wells": 22
        },
        {
          "name": "COSTA LOMA",
          "slug": "costa-loma",
          "wells": 22
        },
        {
          "name": "THE ERIC AND SUSAN DUNN LIVING TRUST DATED JULY 27 2006",
          "slug": "the-eric-and-susan-dunn-living-trust-dated-july-27-2006",
          "wells": 11
        },
        {
          "name": "BOTTO & MILLER TRUSTEES",
          "slug": "botto-miller-trustees",
          "wells": 7
        },
        {
          "name": "PENINSULA OPEN SPACE TRUST",
          "slug": "peninsula-open-space-trust",
          "wells": 6
        },
        {
          "name": "EXXON MOBIL",
          "slug": "exxon-mobil-corporation",
          "wells": 6
        },
        {
          "name": "SHELL OIL COMPANY",
          "slug": "shell-oil-company",
          "wells": 5
        },
        {
          "name": "ZIAVERDE",
          "slug": null,
          "wells": 5
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
      "formationSlug": "santa-barbra-channel-basin",
      "formationName": "Santa Barbra Channel Basin",
      "wellCount": 284,
      "activeOperators": 100,
      "totalLateralFt": "7670",
      "recentPermits24Mo": 4,
      "primaryCounties": "SANTA BARBARA, SANTA CRUZ AREA, SANTA BARBARA OFFSHORE, VENTURA, VENTURA OFFSHORE",
      "topOperators": [
        {
          "name": "DCOR",
          "slug": "dcor",
          "wells": 39
        },
        {
          "name": "UNION OIL COMPANY OF CALIFORNIA",
          "slug": "union-oil-company-of-california",
          "wells": 16
        },
        {
          "name": "VENOCO",
          "slug": "venoco",
          "wells": 16
        },
        {
          "name": "FRED E COLE",
          "slug": null,
          "wells": 15
        },
        {
          "name": "CALNRG OPERATING LLC",
          "slug": "calnrg-operating-llc",
          "wells": 12
        },
        {
          "name": "ARCO OIL & GAS COMPANY",
          "slug": "arco-oil-gas-company",
          "wells": 11
        },
        {
          "name": "EXXON MOBIL",
          "slug": "exxon-mobil-corporation",
          "wells": 10
        },
        {
          "name": "TRANSOCEANIC OIL",
          "slug": null,
          "wells": 10
        },
        {
          "name": "ATLANTIC RICHFIELD COMPANY",
          "slug": "atlantic-richfield-company",
          "wells": 7
        },
        {
          "name": "SABLE OFFSHORE CORP",
          "slug": "sable-offshore-corp",
          "wells": 6
        }
      ],
      "dataAsOf": "2026-08-16"
    },
    {
      "state": "CA",
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          "name": "OPTIMA CONSERVATION RESOURCES EXPLORATION",
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          "name": "STONE CABIN RESOURCES",
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          "name": "PADRE OIL COMPANY",
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        {
          "name": "ARCO WESTERN ENERGY",
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          "name": "JAS E BABCOCK",
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        {
          "name": "COMMUNITY OIL WELL",
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          "name": "LA JOLLA PETRO COMPANY",
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}